//
// "$Id: Fl_Scrollbar.H 9116 2011-10-02 06:25:13Z matt $"
//
// Scroll bar header file for the Fast Light Tool Kit (FLTK).
//
// Copyright 1998-2010 by Bill Spitzak and others.
//
// This library is free software. Distribution and use rights are outlined in
// the file "COPYING" which should have been included with this file.  If this
// file is missing or damaged, see the license at:
//
//     http://www.fltk.org/COPYING.php
//
// Please report all bugs and problems on the following page:
//
//     http://www.fltk.org/str.php
//

/* \file
   Fl_Scrollbar widget . */

#ifndef Fl_Scrollbar_H
#define Fl_Scrollbar_H

#include "Fl_Slider.H"

/**
  The Fl_Scrollbar widget displays a slider with arrow buttons at
  the ends of the scrollbar. Clicking on the arrows move up/left and
  down/right by linesize(). Scrollbars also accept FL_SHORTCUT events:
  the arrows move by linesize(), and vertical scrollbars take Page
  Up/Down (they move by the page size minus linesize()) and Home/End
  (they jump to the top or bottom).

  Scrollbars have step(1) preset (they always return integers). If
  desired you can set the step() to non-integer values. You will then
  have to use casts to get at the floating-point versions of value()
  from Fl_Slider.

  \image html  scrollbar.png
  \image latex scrollbar.png "Fl_Scrollbar" width=4cm
*/
class FL_EXPORT Fl_Scrollbar : public Fl_Slider
{

	int linesize_;
	int pushed_;
	static void timeout_cb(void*);
	void increment_cb();
protected:
	void draw();

public:

	Fl_Scrollbar(int X,int Y,int W,int H, const char *L = 0);
	~Fl_Scrollbar();
	int handle(int);

	/**
	  Gets the integer value (position) of the slider in the scrollbar.
	  You can get the floating point value with Fl_Slider::value().

	  \see Fl_Scrollbar::value(int p)
	  \see Fl_Scrollbar::value(int pos, int size, int first, int total)
	*/
	int value() const {
		return int(Fl_Slider::value());
	}

	/**
	  Sets the value (position) of the slider in the scrollbar.

	  \see Fl_Scrollbar::value()
	  \see Fl_Scrollbar::value(int pos, int size, int first, int total)
	*/
	int value(int p) {
		return int(Fl_Slider::value((double)p));
	}

	/**
	  Sets the position, size and range of the slider in the scrollbar.
	  \param[in] pos   position, first line displayed
	  \param[in] windowSize  number of lines displayed
	  \param[in] first number of first line
	  \param[in] total total number of lines

	  You should call this every time your window changes size, your data
	  changes size, or your scroll position changes (even if in response
	  to a callback from this scrollbar).
	  All necessary calls to redraw() are done.

	  Calls Fl_Slider::scrollvalue(int pos, int size, int first, int total).
	*/
	int value(int pos, int windowSize, int first, int total) {
		return scrollvalue(pos, windowSize, first, total);
	}

	/**
	  Get the size of step, in lines, that the arror keys move.
	*/
	int linesize() const {
		return linesize_;
	}

	/**
	  This number controls how big the steps are that the arrow keys do.
	  In addition page up/down move by the size last sent to value()
	  minus one linesize().  The default is 16.
	*/
	void linesize(int i) {
		linesize_ = i;
	}

};

#endif

//
// End of "$Id: Fl_Scrollbar.H 9116 2011-10-02 06:25:13Z matt $".
//
